/**
 * @file
 * Ethernet Interface Skeleton
 *
 */

/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */

#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/timeouts.h"
#include "netif/etharp.h"
#include "err.h"
#include "ethernetif.h"

#include "GD32_EnetPHY_Init.h"
#include "gd32f4xx_enet.h"
#include <string.h>
#include "FreeRTOS.h"
#include "event_groups.h"
#include "GD32_Init.H"
#include "semphr.h"

#define ETHERNETIF_INPUT_TASK_STACK_SIZE (configMINIMAL_STACK_SIZE * 2)
#define ETHERNETIF_INPUT_TASK_PRIO (configMAC_INPUT_TASK_PRIORITY)
#define LOWLEVEL_OUTPUT_WAITING_TIME (250)
/* The time to block waiting for input */
#define LOWLEVEL_INPUT_WAITING_TIME ((portTickType)100)

/* define those to better describe your network interface */
#define IFNAME0 'G'
#define IFNAME1 'D'

/* ENET RxDMA/TxDMA descriptor */
extern enet_descriptors_struct rxdesc_tab[ENET_RXBUF_NUM], txdesc_tab[ENET_TXBUF_NUM];

/* ENET receive buffer  */
extern uint8_t rx_buff[ENET_RXBUF_NUM][ENET_RXBUF_SIZE];

/* ENET transmit buffer */
extern uint8_t tx_buff[ENET_TXBUF_NUM][ENET_TXBUF_SIZE];

/*global transmit and receive descriptors pointers */
extern enet_descriptors_struct *dma_current_txdesc;
extern enet_descriptors_struct *dma_current_rxdesc;

/* preserve another ENET RxDMA/TxDMA ptp descriptor for normal mode */
enet_descriptors_struct ptp_txstructure[ENET_TXBUF_NUM];
enet_descriptors_struct ptp_rxstructure[ENET_RXBUF_NUM];

static struct netif *low_netif = NULL;
// xSemaphoreHandle g_rx_semaphore = NULL;

/**
 * In this function, the hardware should be initialized.
 * Called from ethernetif_init().
 *
 * @param netif the already initialized lwip network interface structure
 *        for this ethernetif
 */
TaskHandle_t EnetInputTaskHandle = NULL;
static void low_level_init(struct netif *netif)
{
    uint32_t i;

    /* set netif MAC hardware address length */
    netif->hwaddr_len = ETHARP_HWADDR_LEN;

    /* set netif MAC hardware address */
    netif->hwaddr[0] = MAC_ADDR0;
    netif->hwaddr[1] = MAC_ADDR1;
    netif->hwaddr[2] = MAC_ADDR2;
    netif->hwaddr[3] = MAC_ADDR3;
    netif->hwaddr[4] = MAC_ADDR4;
    netif->hwaddr[5] = MAC_ADDR5;

    /* set netif maximum transfer unit */
    netif->mtu = 1500;

    /* accept broadcast address and ARP traffic */
    netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;

    low_netif = netif;

    /* create binary semaphore used for informing ethernetif of frame reception */
    // if (g_rx_semaphore == NULL)
    // {
    //     g_rx_semaphore = xSemaphoreCreateCounting(10, 0);
    //     if (g_rx_semaphore != NULL)
    //     {
    //     }
    //     else
    //     {
    //         Usr_Log("%s", "Create semaphore fault", __FILE__);
    //     }
    // }

    /* initialize MAC address in ethernet MAC */
    enet_mac_address_set(ENET_MAC_ADDRESS0, netif->hwaddr);

    /* initialize descriptors list: chain/ring mode */
#ifdef SELECT_DESCRIPTORS_ENHANCED_MODE
    enet_ptp_enhanced_descriptors_chain_init(ENET_DMA_TX);
    enet_ptp_enhanced_descriptors_chain_init(ENET_DMA_RX);
#else

    enet_descriptors_chain_init(ENET_DMA_TX);
    enet_descriptors_chain_init(ENET_DMA_RX);

    //    enet_descriptors_ring_init(ENET_DMA_TX);
    //    enet_descriptors_ring_init(ENET_DMA_RX);

#endif /* SELECT_DESCRIPTORS_ENHANCED_MODE */

    /* enable ethernet Rx interrrupt */
    {
        int i;
        for (i = 0; i < ENET_RXBUF_NUM; i++)
        {
            enet_rx_desc_immediate_receive_complete_interrupt(&rxdesc_tab[i]);
        }
    }

#ifdef CHECKSUM_BY_HARDWARE
    /* enable the TCP, UDP and ICMP checksum insertion for the Tx frames */
    for (i = 0; i < ENET_TXBUF_NUM; i++)
    {
        enet_transmit_checksum_config(&txdesc_tab[i], ENET_CHECKSUM_TCPUDPICMP_FULL);
    }
#endif /* CHECKSUM_BY_HARDWARE */

    /* create the task that handles the ETH_MAC */
    xTaskCreate(ethernetif_input, "ETHERNETIF_INPUT", ETHERNETIF_INPUT_TASK_STACK_SIZE, NULL,
                ETHERNETIF_INPUT_TASK_PRIO, &EnetInputTaskHandle);

    /* enable MAC and DMA transmission and reception */
    enet_enable();
}

/**
 * This function should do the actual transmission of the packet. The packet is
 * contained in the pbuf that is passed to the function. This pbuf
 * might be chained.
 *
 * @param netif the lwip network interface structure for this ethernetif
 * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
 * @return ERR_OK if the packet could be sent
 *         an err_t value if the packet couldn't be sent
 *
 * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
 *       strange results. You might consider waiting for space in the DMA queue
 *       to become availale since the stack doesn't retry to send a packet
 *       dropped because of memory failure (except for the TCP timers).
 */

static err_t low_level_output(struct netif *netif, struct pbuf *p)
{
    static xSemaphoreHandle s_tx_semaphore = NULL;
    struct pbuf *q;
    uint8_t *buffer;
    uint16_t framelength = 0;
    ErrStatus reval = ERROR;

    SYS_ARCH_DECL_PROTECT(sr);

    if (s_tx_semaphore == NULL)
    {
        vSemaphoreCreateBinary(s_tx_semaphore);
    }

    if (xSemaphoreTake(s_tx_semaphore, LOWLEVEL_OUTPUT_WAITING_TIME))
    {
        SYS_ARCH_PROTECT(sr);

        while ((uint32_t)RESET != (dma_current_txdesc->status & ENET_TDES0_DAV))
        {
        }
        buffer = (uint8_t *)(enet_desc_information_get(dma_current_txdesc, TXDESC_BUFFER_1_ADDR));

        for (q = p; q != NULL; q = q->next)
        {
            memcpy((uint8_t *)&buffer[framelength], q->payload, q->len);
            framelength = framelength + q->len;
        }

        /* transmit descriptors to give to DMA */
#ifdef SELECT_DESCRIPTORS_ENHANCED_MODE
        reval = ENET_NOCOPY_PTPFRAME_TRANSMIT_ENHANCED_MODE(framelength, NULL);
#else
        reval = ENET_NOCOPY_FRAME_TRANSMIT(framelength);
#endif /* SELECT_DESCRIPTORS_ENHANCED_MODE */

        SYS_ARCH_UNPROTECT(sr);

        /* give semaphore and exit */
        xSemaphoreGive(s_tx_semaphore);
    }

    if (SUCCESS == reval)
    {
        return ERR_OK;
    }
    else
    {
        while (1)
        {
        }
    }
}

/**
 * Should allocate a pbuf and transfer the bytes of the incoming
 * packet from the interface into the pbuf.
 *
 * @param netif the lwip network interface structure for this ethernetif
 * @return a pbuf filled with the received packet (including MAC header)
 *         NULL on memory error
 */
static struct pbuf *low_level_input(struct netif *netif)
{
    struct pbuf *p = NULL, *q;
    uint32_t l = 0;
    u16_t len;
    uint8_t *buffer;

    /* obtain the size of the packet and put it into the "len" variable. */
    len = enet_desc_information_get(dma_current_rxdesc, RXDESC_FRAME_LENGTH);
    buffer = (uint8_t *)(enet_desc_information_get(dma_current_rxdesc, RXDESC_BUFFER_1_ADDR));

    if (len > 0)
    {
        /* We allocate a pbuf chain of pbufs from the Lwip buffer pool */
        p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
    }

    if (p != NULL)
    {
        for (q = p; q != NULL; q = q->next)
        {
            memcpy((uint8_t *)q->payload, (u8_t *)&buffer[l], q->len);
            l = l + q->len;
        }
    }
#ifdef SELECT_DESCRIPTORS_ENHANCED_MODE
    ENET_NOCOPY_PTPFRAME_RECEIVE_ENHANCED_MODE(NULL);

#else

    ENET_NOCOPY_FRAME_RECEIVE();
#endif /* SELECT_DESCRIPTORS_ENHANCED_MODE */

    return p;
}

/**
 * This function is the ethernetif_input task, it is processed when a packet
 * is ready to be read from the interface. It uses the function low_level_input()
 * that should handle the actual reception of bytes from the network
 * interface. Then the type of the received packet is determined and
 * the appropriate input function is called.
 *
 * @param netif the lwip network interface structure for this ethernetif
 */
void StreamSentVr(uint8_t *pStream, uint16_t len);
void ethernetif_input(void *pvParameters)
{
    struct pbuf *p;
    uint32_t ulNotificationValue;
    SYS_ARCH_DECL_PROTECT(sr);

    for (;;)
    {
        // StreamSentVr("enet: Enet entry waiting mode", 0);
        ulNotificationValue = ulTaskNotifyTake(pdFAIL, portMAX_DELAY/* LOWLEVEL_INPUT_WAITING_TIME */);
        // if (xSemaphoreTake(g_rx_semaphore, LOWLEVEL_INPUT_WAITING_TIME) == pdTRUE)
        // {
        if (ulNotificationValue > 0)
        {
        TRY_GET_NEXT_FRAME:
            SYS_ARCH_PROTECT(sr);
            p = low_level_input(low_netif);
            SYS_ARCH_UNPROTECT(sr);

            if (p != NULL)
            {
                if (ERR_OK != low_netif->input(p, low_netif))
                {
                    pbuf_free(p);
                }
                else
                {
                    goto TRY_GET_NEXT_FRAME;
                }
            }
        }
    }
}

// static void
// arp_timer(void *arg)
// {
//   etharp_tmr();
//   sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
// }

/**
 * Should be called at the beginning of the program to set up the
 * network interface. It calls the function low_level_init() to do the
 * actual setup of the hardware.
 *
 * This function should be passed as a parameter to netif_add().
 *
 * @param netif the lwip network interface structure for this ethernetif
 * @return ERR_OK if the loopif is initialized
 *         ERR_MEM if private data couldn't be allocated
 *         any other err_t on error
 */
err_t ethernetif_init(struct netif *netif)
{
    LWIP_ASSERT("netif != NULL", (netif != NULL));

#if LWIP_NETIF_HOSTNAME
    /* initialize interface hostname */
    netif->hostname = "lwip";
#endif /* LWIP_NETIF_HOSTNAME */

    netif->name[0] = IFNAME0;
    netif->name[1] = IFNAME1;

    netif->output = etharp_output;
    netif->linkoutput = low_level_output;

    /* initialize the hardware */
    low_level_init(netif);

    // etharp_init();
    // sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);

    return ERR_OK;
}
